Tue, 27 Apr 1999 15:13:18 +0200 wenzelm verbose flag;
Tue, 27 Apr 1999 15:12:34 +0200 wenzelm use_thy_only made pervasive;
Tue, 27 Apr 1999 15:10:36 +0200 wenzelm added Isar_examples/NatSum.thy;
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